Progress MOVEIt File transfer folder count above threshold

Severity: medium
Time window: 15m
Group by: Computer, ipaddress, userdisplayname, username
Source: github.com/Azure/Azure-Sentinel

Identifies Progress MOVEIt File Transfers with distinct folder count above certain threshold in a 15min time period. Please note that entity mapping for arrays is not supported, so when there is a single value in an array, we will pull that value from the array as a single string to populate the entity to support entity mapping features within Sentinel. Additionally, if the array is multivalued, we will input a string to indicate this with a unique hash so that matching will not occur.

MITRE ATT&CK coverage

Tactic	Techniques
Exfiltration	`T1020` Automated Exfiltration

Telemetry coverage

Provider	Record / event type
MOVEit-DMZ-Audit	Event ID 0: MOVEit file-transfer audit record

Rule body

id: 26a993ca-0a96-45a0-8405-05a210fb98f8
name: Progress MOVEIt File transfer folder count above threshold
description: |
  'Identifies Progress MOVEIt File Transfers  with distinct folder count above certain threshold in a 15min time period.
   Please note that entity mapping for arrays is not supported, so when there is a single value in an array, we will pull that value from the array as a single string to populate the entity to support entity mapping features within Sentinel. Additionally, if the array is multivalued, we will input a string to indicate this with a unique hash so that matching will not occur.'
severity: Medium
requiredDataConnectors:
  - connectorId: WindowsForwardedEvents
    dataTypes:
      - WindowsEvent
queryFrequency: 15m
queryPeriod: 15m
triggerOperator: gt
triggerThreshold: 0
tactics:
  - Exfiltration
relevantTechniques:
  - T1020
query: |
  let threshold = 500;
  Event
  | where EventID == 0 and Source == "MOVEit DMZ Audit" and EventLog == "Application"
  | where RenderedDescription has_any ("Downloaded", "Uploaded")
  | parse RenderedDescription with * "User '" userdisplayname "' (" *
  | parse RenderedDescription with * "IPAddress: " ipaddress " FileID:" * " FileName: " filename " FolderID: " folderid " FolderPath: " folderpath " Username: " username " AgentBrand: " *
  | summarize count_distinct_folderpath=dcount(folderpath), dirlist=make_set(folderpath) by Computer,userdisplayname,username,ipaddress,bin(TimeGenerated, 15m)
  | where count_distinct_folderpath >= threshold
  | extend DirSample = iff(array_length(dirlist) == 1, tostring(dirlist[0]), strcat("SeeDirListField","_", tostring(hash(tostring(dirlist)))))
entityMappings:
  - entityType: Account
    fieldMappings:
      - identifier: Name
        columnName: userdisplayname
  - entityType: IP
    fieldMappings:
      - identifier: Address
        columnName: ipaddress
  - entityType: Host
    fieldMappings:
      - identifier: HostName
        columnName: Computer
  - entityType: File
    fieldMappings:
      - identifier: Name
        columnName: DirSample
customDetails:
  TransferCount: count_distinct_folderpath
  FilesList: dirlist
incidentConfiguration:
  createIncident: true
  groupingConfiguration:
    enabled: true
    reopenClosedIncident: false
    lookbackDuration: 5h
    matchingMethod: Selected
    groupByEntities:
    - Account
    - Host
version: 1.0.2
kind: Scheduled

Stages and Predicates

Parameters

let threshold = 500;

Stage 1: `source`

Event

Stage 2: `where`

| where EventID == 0 and Source == "MOVEit DMZ Audit" and EventLog == "Application"

Stage 3: `where`

| where RenderedDescription has_any ("Downloaded", "Uploaded")

Stage 4: `parse`

| parse RenderedDescription with * "User '" userdisplayname "' (" *

Stage 5: `parse`

| parse RenderedDescription with * "IPAddress: " ipaddress " FileID:" * " FileName: " filename " FolderID: " folderid " FolderPath: " folderpath " Username: " username " AgentBrand: " *

Stage 6: `summarize`

| summarize count_distinct_folderpath=dcount(folderpath), dirlist=make_set(folderpath) by Computer,userdisplayname,username,ipaddress,bin(TimeGenerated, 15m)

Stage 7: `where`

| where count_distinct_folderpath >= threshold

Stage 8: `extend`

| extend DirSample = iff(array_length(dirlist) == 1, tostring(dirlist[0]), strcat("SeeDirListField","_", tostring(hash(tostring(dirlist)))))

DirSample =

ifdirlist == 1tostring(dirlist[0])

elsestrcat("SeeDirListField", "_", tostring(hash(tostring(dirlist))))

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`EventID`	eq	`0` corpus 2 (kusto 2)	`field:"EventID" kind:eq value:"0"`
`EventLog`	eq	`Application` corpus 2 (kusto 2)	`field:"EventLog" kind:eq value:"Application"`
`RenderedDescription`	match	`Downloaded` transforms: `term` corpus 2 (kusto 2) `Uploaded` transforms: `term` corpus 2 (kusto 2)	`field:"RenderedDescription" kind:match`
`count_distinct_folderpath`	ge	`500`	`field:"count_distinct_folderpath" kind:ge value:"500"`

Output fields

These fields are emitted when the rule matches.

Field	Source
`Computer`	`summarize`
`count_distinct_folderpath`	`summarize`
`dirlist`	`summarize`
`ipaddress`	`summarize`
`userdisplayname`	`summarize`
`username`	`summarize`
`DirSample`	`extend`

Progress MOVEIt File transfer folder count above threshold

MITRE ATT&CK coverage

Telemetry coverage

Rule body

Stages and Predicates

Parameters

Stage 1: source

Stage 2: where

Stage 3: where

Stage 4: parse

Stage 5: parse

Stage 6: summarize

Stage 7: where

Stage 8: extend